CN116871151A - Piezoelectric air coupling transducer for high temperature and high pressure - Google Patents
Piezoelectric air coupling transducer for high temperature and high pressure Download PDFInfo
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- CN116871151A CN116871151A CN202310817790.1A CN202310817790A CN116871151A CN 116871151 A CN116871151 A CN 116871151A CN 202310817790 A CN202310817790 A CN 202310817790A CN 116871151 A CN116871151 A CN 116871151A
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- 238000010168 coupling process Methods 0.000 title claims abstract description 26
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 26
- 230000008878 coupling Effects 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 65
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- 239000000919 ceramic Substances 0.000 claims description 13
- 239000004593 Epoxy Substances 0.000 claims description 10
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000003860 storage Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 60
- 238000013461 design Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention provides a piezoelectric air coupling transducer for high temperature and high pressure, which comprises a shell, a matching layer, a piezoelectric sheet, a back lining, an interface and a processing device, wherein the shell is arranged on the back lining; the backing, the piezoelectric sheet and the matching layer are sequentially arranged along the ultrasonic signal transmitting direction and are encapsulated in the shell, the processing device is used for calculating the thickness of the piezoelectric sheet according to the material parameters of the materials selected by the piezoelectric sheet, and the processing device is also used for carrying out finite element analysis according to the material parameters corresponding to the materials selected by the matching layer to obtain the thickness of the matching layer. The thickness of the piezoelectric sheet can be calculated, the thickness of the matching layer is designed through a finite element method, the piezoelectric sheet can be applied to selection and application of various materials, can be used for ultrasonic ranging in high-temperature and high-pressure environments, and overcomes the influence of high temperature and high pressure on a general air-coupled transducer, so that the piezoelectric sheet has a good application prospect in the field of cavity medium acoustic ranging such as underground gas storage.
Description
Technical Field
The invention mainly relates to the technical field of air coupling transducers, in particular to a piezoelectric air coupling transducer for high temperature and high pressure.
Background
The air coupling transducer is characterized in that an electric signal with the same or similar mechanical resonance frequency and a certain amplitude is applied to the air coupling transducer, the electric signal drives the active element of the transducer to vibrate, the electric energy is converted into mechanical energy, the mechanical energy is converted into acoustic energy through vibration, sound waves are emitted into the air, and the sound waves return after touching a tested object and are received and converted into the electric signal by the transducer. The time interval between the signal sent by the transducer and the received callback signal is in direct proportion to the distance between the transducer and the object surface, the transducer structure of the similar products at home and abroad is generally a sandwich vibrator and an acoustic impedance matching part, the core of the air coupling transducer is the acoustic impedance matching part, the acoustic impedance of air is far smaller than that of piezoelectric ceramics, and in order to enable sound waves to be transmitted from the piezoelectric ceramics to the air, an acoustic impedance matching material is needed. The acoustic impedance matching part is mainly made of hard plastic, glass beads and foam materials.
At present, a single-layer or double-layer matching layer is adopted in an air coupling transducer, a matching material is formed by mixing and solidifying hollow glass bead powder and epoxy resin or a matching material made of a microporous foaming polymer, although the commonly used transducer can well match acoustic impedance in piezoelectric ceramics and air, the adopted matching layer material is a pressure sensitive material, for example, the density and acoustic performance of the air glass bead and the microporous foaming polymer can be greatly changed under a high-pressure environment, the coupling of the air coupling transducer under high-pressure air is influenced, and even the matching effect of the seriously matching layer is lost. There is a need to address the problem of air coupling at high pressures and even at high temperatures.
Disclosure of Invention
The invention aims to solve the technical problem of providing a piezoelectric air coupling transducer for high temperature and high pressure aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: a piezoelectric air coupling transducer for high temperature and high pressure comprises a shell, a matching layer, a piezoelectric sheet, a back lining, an interface and a processing device;
the backing, the piezoelectric sheet and the matching layer are sequentially arranged along the ultrasonic signal transmitting direction and are encapsulated in the shell, the processing device is used for calculating the thickness of the piezoelectric sheet according to the material parameters of the materials selected by the piezoelectric sheet, and is also used for carrying out finite element analysis according to the material parameters corresponding to the materials selected by the matching layer to obtain the thickness of the matching layer.
The beneficial effects of the invention are as follows: the thickness of the piezoelectric sheet can be calculated, the thickness of the matching layer is designed through a finite element method, the method can be suitable for selecting and applying various materials, can be used for ultrasonic ranging in high-temperature and high-pressure environments, overcomes the influence of high temperature and high pressure on a common air-coupled transducer, and has good application prospect in the field of cavity medium acoustic ranging of underground gas storages and the like.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the backing is made of pressure-resistant materials, the matching layer is made of pressure-resistant buoyancy materials, and the piezoelectric sheet is made of high-temperature piezoelectric ceramics.
The beneficial effects of adopting the further scheme are as follows: the backing is made of pressure-resistant materials, so that the safety of the piezoelectric ceramics under vibration can be protected; different pressure-resistant materials can be selected according to different pressure-resistant conditions.
Further, in the processing device, the thickness of the piezoelectric sheet is calculated according to the material property of the material selected by the piezoelectric sheet, specifically:
calculating the thickness of the piezoelectric sheet by a first formula and the material property of the material selected by the piezoelectric sheet, wherein the first formula is as follows:
where h represents the thickness of the piezoelectric sheet, c represents the longitudinal wave sound velocity of the piezoelectric sheet, f represents the target frequency, and λ represents the wavelength corresponding to the target ultrasonic frequency.
Further, in the processing device, finite element analysis is performed according to material parameters corresponding to the material selected by the matching layer, so as to obtain the thickness of the matching layer, specifically:
and testing the pressure resistance of the selected material to obtain sound velocity, density and acoustic impedance, substituting the sound velocity, density and acoustic impedance into a finite element model, dividing the finite element model in a scanning mode, setting the step length of parameterized scanning, outputting a plurality of admittance values through the step length and the divided finite element model, selecting the maximum admittance value from the plurality of admittance values, and obtaining the thickness of the matching layer according to the maximum admittance value.
The beneficial effects of adopting the further scheme are as follows: according to different pressure-resistant conditions, different matching layer materials are selected, and the optimal thickness of the matching layer is analyzed through finite elements, so that the performance of the air-coupled transducer in high-pressure air is greatly improved.
Further, the processing device is further used for displaying the output admittance values and the obtained thickness of the matching layer.
Further, the matching layer and the back lining are of round sheet structures, the matching layer and the back lining are nested concentrically with the piezoelectric sheet, and the matching layer, the back lining and the piezoelectric sheet are bonded with each other through epoxy resin.
The beneficial effects of adopting the further scheme are as follows: the high-temperature epoxy seal is used, so that the air-coupling transducer can be applied to ranging in high-temperature and high-pressure environments.
Further, excess of the epoxy resin between the matching layer, the backing and the piezoelectric sheet is extruded by a pressure device to bond the matching layer, the backing and the piezoelectric sheet.
Further, electrodes are arranged on two sides of the piezoelectric sheet, and wires are led out from the electrodes on two sides, and are electrically connected with an external instrument along a back wire groove electric connection interface.
Further, the electrodes arranged on the two sides of the piezoelectric sheet are copper plating electrodes.
Further, an O-shaped ring groove is arranged between the shell and the interface.
Drawings
FIG. 1 is a cross-sectional view of a piezoelectric air-coupled transducer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a finite element model according to an embodiment of the present invention;
FIG. 3 is an admittance curve of a transducer around a design frequency at different thicknesses of a matching layer suitable for use under 120MPa high pressure air.
In the drawings, the names of the components represented by the respective marks are as follows:
1. the device comprises a shell, 2, epoxy resin, 3, a matching layer, 4, a piezoelectric sheet, 5, a back lining, 6, an interface, 7, an O-shaped ring groove, 8, a back lining wire groove, 9, an air medium in a finite element model, 10, a matching layer in a finite element model, 11, a piezoelectric sheet electrode in a finite element model and 12, and a piezoelectric ceramic sheet in a finite element model.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
The invention aims to solve the technical problem of impedance mismatch caused by density and acoustic property change of a matching layer of the existing air coupling ultrasonic piezoelectric transducer under high pressure, and provides a thickness mode piezoelectric high-voltage air coupling transducer which adopts a hard pressure-resistant buoyancy material as the matching layer, different matching layer materials are selected according to different pressure-resistant conditions, and the optimal matching layer is analyzed through a finite element, so that the performance of the air coupling transducer in high-pressure air is greatly improved. The invention has good application prospect in the field of acoustic ranging of cavity media such as underground gas storage and the like. The following is a detailed description of the embodiments:
example 1:
as shown in fig. 1, a piezoelectric air-coupled transducer for high temperature and high pressure comprises a housing 1, a matching layer 3, a piezoelectric sheet 4, a backing 5, an interface 6 and a processing device;
the backing 5, the piezoelectric sheet 4 and the matching layer 3 are sequentially arranged along the ultrasonic signal transmitting direction and are encapsulated in the shell 1, the processing device is used for calculating the thickness of the piezoelectric sheet 4 according to the material parameters of the material selected by the piezoelectric sheet 4, and is also used for carrying out finite element analysis according to the material parameters corresponding to the material selected by the matching layer 3 to obtain the thickness of the matching layer.
In the embodiment, the thickness of the piezoelectric sheet can be calculated, the thickness of the matching layer is designed through a finite element method, the method can be suitable for selecting and applying various materials, can be used for ultrasonic ranging in a high-temperature high-pressure environment, overcomes the influence of high temperature and high pressure on a general air-coupled transducer, and has good application prospect in the field of acoustic ranging of cavity media such as underground gas storages.
Example 2, based on example 1:
the backing 5 is made of pressure-resistant materials, the matching layer 3 is made of pressure-resistant buoyancy materials, and the piezoelectric sheet 4 is made of high-temperature piezoelectric ceramics.
In the embodiment, the backing is made of pressure-resistant materials, so that the safety of the piezoelectric ceramics under vibration can be protected; different pressure-resistant materials can be selected according to different pressure-resistant conditions.
Example 3, based on example 1:
in the processing device, the thickness of the piezoelectric sheet is calculated according to the material property of the material selected by the piezoelectric sheet 4, specifically:
the thickness of the piezoelectric sheet 4 is calculated from a first equation, which is:
where h denotes the thickness of the piezoelectric sheet 4, c denotes the longitudinal wave sound velocity of the piezoelectric sheet 4, f denotes the target frequency, and λ denotes the wavelength corresponding to the target ultrasonic frequency.
H in fig. 1 is the thickness of the piezoelectric sheet 4.
An example of an air-coupled ultrasonic piezoelectric transducer with a target frequency of 200kHz for a high pressure gas of 120MPa is given below:
the piezoelectric sheet of the high-pressure air coupling transducer is high-temperature piezoelectric ceramic PZT-4, the acoustic impedance of the piezoelectric sheet is 34MRay1, and the longitudinal wave acoustic velocity is 4600m/s. The thickness of the piezoelectric sheet 4 is calculated by using a formula 1 of An Zhao, wherein the wavelength is half of the wavelength corresponding to the design frequency of the ultrasonic signal.
Where h denotes the thickness of the piezoelectric sheet 4, c denotes the longitudinal wave sound velocity of the piezoelectric sheet 4, f denotes the designed frequency, and λ denotes the wavelength corresponding to the designed ultrasonic frequency.
As a result of the calculation, the piezoelectric sheet was polarized in the thickness direction, the thickness of the piezoelectric sheet was one half wavelength corresponding to the design frequency, the thickness of the piezoelectric sheet was 10mm, and the diameter was 50mm.
Example 4, based on example 1:
in the processing device, finite element analysis is performed according to material parameters corresponding to the material selected by the matching layer 3, so as to obtain the thickness of the matching layer 3, specifically:
and testing the pressure resistance of the selected material to obtain sound velocity, density and acoustic impedance, substituting the sound velocity, density and acoustic impedance into a finite element model, dividing the finite element model in a scanning mode, setting the step length of parameterized scanning, outputting a plurality of admittance values through the step length and the divided finite element model, selecting the maximum admittance value from the plurality of admittance values, and obtaining the thickness of the matching layer 3 according to the maximum admittance value.
Specifically, the matching layer adopts high-pressure resistant buoyancy materials, different pressure resistant materials are selected according to different high-pressure properties, and the selectable pressure resistant parameters are 10MPa, 50MPa and 120MPa.
For example, a buoyancy material with a withstand voltage of 120MPa is selected to obtain sound velocity, density and sound impedance, parameters are substituted into a finite element model for calculation, that is, each parameter is input into the finite element model through software, sound velocity, density and sound impedance of a matching layer are input after measurement, and admittance values of the transducer in a frequency range of 100-300 kHz under different thicknesses are calculated.
By adopting a finite element analysis method for the thickness of the matching layer, only the most suitable thickness of the matching layer is needed to be obtained through analysis, only the parameters of the air medium 9, the parameters of the matching layer 10 and the parameters of the piezoelectric ceramic 12 are needed to be considered when the finite element model is built, in order to obtain a result quickly, only the air medium 9 in the finite element model, the matching layer 10 in the finite element model and the piezoelectric ceramic 12 in the finite element model are needed to be considered in modeling, the finite element model is used, the material properties of all parts are distributed, the finite element model is divided in a scanning mode, corresponding loads are applied to the piezoelectric plate electrode 11 (piezoelectric ceramic electrode) in the finite element model, the admittance value of the transducer in the range from 150kHz to 250kHz under the thickness of the matching layer from 1mm to 4mm is calculated through parameterized scanning, and the step size of parameterized scanning is 0.1mm.
When the impedance matching is most suitable, the output acoustic energy is maximum, and the admittance value corresponding to the design frequency is larger, so that the admittance values of a plurality of thicknesses at the design frequency are calculated, the calculated result is shown in fig. 3, and only a few thicknesses near the optimal value are selected for display convenience. The calculated step length is determined according to the actual situation and the machining precision. The thickness of the matching layer in this example was 2.3mm.
H in FIG. 1 1 Is the thickness of the matching layer 3.
In the embodiment, different matching layer materials are selected according to different pressure-resistant conditions, and the optimal thickness of the matching layer is analyzed through finite element, so that the performance of the air-coupled transducer in high-pressure air is greatly improved.
Example 5, based on example 4:
the processing means is further adapted to display the output plurality of admittance values and the resulting thickness of the matching layer 3.
In the above embodiment, the results can be displayed, and the results can be known quickly.
Example 5, based on example 4:
the matching layer 3 and the back lining 5 are of round sheet structures, the matching layer 3 and the back lining 5 are nested concentrically with the piezoelectric sheet 4, and the matching layer 3, the back lining 5 and the piezoelectric sheet 4 are bonded with each other through the epoxy resin 2.
In the embodiment, the high-temperature epoxy seal is used, so that the air-coupling transducer can be applied to ranging in high-temperature and high-pressure environments.
The high-temperature epoxy adopts Duralco 4538 soft epoxy resin, the epoxy can maintain the property at a high temperature of 200 ℃, and the bonding load force of the epoxy is small, so that the epoxy is particularly suitable for bonding in a vibration mode.
Example 7, based on example 6:
excess epoxy 2 between the matching layer 3, the backing 5 and the piezoelectric sheet 4 is extruded by a pressure means leaving a very thin layer to bond the matching layer 3, the backing 5 and the piezoelectric sheet 4.
Example 8, based on example 1:
electrodes are arranged on two sides of the piezoelectric sheet 4, and wires are led out from the electrodes on the two sides, and are electrically connected with an interface 6 and an external instrument along a backing wire groove 8.
Example 9, based on example 8:
the electrodes arranged on the two sides of the piezoelectric sheet 4 are copper plating electrodes.
Example 10, based on example 8:
an O-shaped ring groove 7 is arranged between the shell 1 and the interface 6.
Specifically, the external instrument includes a processing device, a downhole ranging machine, or an external power source, etc. For example, the interface is connected to the downhole ranging machine by screws and O-ring grooves 7.
The invention provides a thickness mode piezoelectric transducer with a single matching layer structure, which uses a high-pressure resistant material as a matching layer and calculates the most suitable thickness by utilizing a finite element, and soft high-temperature epoxy encapsulation is used, so that the transducer can be widely applied to high-temperature high-pressure air which cannot be used by the current air-coupled transducer. And various pressure-resistant materials can be selectively applied, and the thickness of the matching layer is designed through finite element calculation, so that the sensitivity of the thickness-mode piezoelectric air-coupled transducer is remarkably improved.
The matching layer is made of pressure-resistant buoyancy materials, different pressure-resistant materials are selected according to different pressure-resistant conditions, the thickness of the matching layer is determined according to finite element analysis, and high-temperature epoxy sealing is used, so that the air-to-air transducer can be applied to ranging in high-temperature and high-pressure environments.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The piezoelectric air coupling transducer for high temperature and high pressure is characterized by comprising a shell (1), a matching layer (3), a piezoelectric sheet (4), a back lining (5), an interface (6) and a processing device;
the backing (5), the piezoelectric sheet (4) and the matching layer (3) are sequentially arranged along the ultrasonic signal transmitting direction and are encapsulated in the shell (1), the processing device is used for calculating the thickness of the piezoelectric sheet (4) according to the material parameters of the materials selected by the piezoelectric sheet (4), and is also used for carrying out finite element analysis according to the material parameters corresponding to the materials selected by the matching layer (3) to obtain the thickness of the matching layer (3).
2. The piezoelectric air-coupling transducer according to claim 1, wherein the backing (5) is made of a pressure-resistant material, the matching layer (3) is made of a pressure-resistant buoyancy material, and the piezoelectric plate (4) is made of high-temperature piezoelectric ceramic.
3. The piezoelectric air-coupled transducer according to claim 1, wherein the processing means calculate the thickness of the piezoelectric sheet (4) from the material properties of the material selected for the piezoelectric sheet, in particular:
calculating the thickness of the piezoelectric sheet (4) from a first formula and a material property of a material selected for the piezoelectric sheet (4), the first formula being:
wherein h represents the thickness of the piezoelectric sheet (4), c represents the longitudinal wave sound velocity of the piezoelectric sheet (4), f represents the target frequency, and λ represents the wavelength corresponding to the target ultrasonic frequency.
4. The piezoelectric air-coupling transducer according to claim 1, wherein the processing device performs finite element analysis according to material parameters corresponding to the material selected by the matching layer (3) to obtain the thickness of the matching layer (3), specifically:
and testing the pressure resistance of the selected material to obtain sound velocity, density and acoustic impedance, substituting the sound velocity, density and acoustic impedance into a finite element model, dividing the finite element model in a scanning mode, setting the step length of parameterized scanning, outputting a plurality of admittance values through the step length and the divided finite element model, selecting the maximum admittance value from the plurality of admittance values, and obtaining the thickness of the matching layer (3) according to the maximum admittance value.
5. The piezoelectric air-coupled transducer according to claim 4, characterized in that the processing means are further adapted to display a plurality of admittance values of the output and the resulting thickness of the matching layer (3).
6. The piezoelectric air-coupled transducer according to claim 1, wherein the matching layer (3) and the backing (5) are of a circular sheet-like structure, the matching layer (3) and the backing (5) are concentrically nested with the piezoelectric sheet (4), and the matching layer (3), the backing (5) and the piezoelectric sheet (4) are bonded to each other by epoxy (2).
7. The piezoelectric high-temperature high-pressure air-coupling transducer according to claim 6, wherein the excess epoxy resin (2) between the matching layer (3), the backing (5) and the piezoelectric sheet (4) is extruded by a pressure device to bond the matching layer (3), the backing (5) and the piezoelectric sheet (4).
8. The piezoelectric air-coupling transducer according to claim 1, wherein the piezoelectric sheet (4) is provided with electrodes on both sides, and leads are led out from the electrodes on both sides, and the leads are conducted with an external instrument along the electrical connection interface (6) of the backing wire groove (8).
9. The piezoelectric air-coupling transducer according to claim 8, wherein the electrodes provided on both sides of the piezoelectric sheet (4) are copper-plated electrodes.
10. Piezoelectric air-coupled transducer according to claim 8, characterized in that an O-ring groove (7) is provided between the housing (1) and the interface (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310817790.1A CN116871151A (en) | 2023-07-05 | 2023-07-05 | Piezoelectric air coupling transducer for high temperature and high pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310817790.1A CN116871151A (en) | 2023-07-05 | 2023-07-05 | Piezoelectric air coupling transducer for high temperature and high pressure |
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| CN116871151A true CN116871151A (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310817790.1A Pending CN116871151A (en) | 2023-07-05 | 2023-07-05 | Piezoelectric air coupling transducer for high temperature and high pressure |
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| Country | Link |
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| CN (1) | CN116871151A (en) |
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- 2023-07-05 CN CN202310817790.1A patent/CN116871151A/en active Pending
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